- The GPS tracking's brand
- The settings of how frequent you define it to upload the data
- and partly on your telecom operator too.

But either case to receive 400 updates per day, it will consume less than 50MB per month.
You need also to know that if you configure it correctly, and the tracker's manufacturer has engineered the packets well, the consumption can be as low as 5MB per month for the same 400 updates per day.